Genomic fragment carrying Mlc2.
The myofibrillar and sarcomeric structures of the indirect flight muscle (IFM) of Mlc2E38 flies carrying two copies of Mlc2+tTa appear normal. IFM fibers fixed in the rigor state have well-ordered cross-bridge arrays. The flight index of these flies is 5.4 +/- 0.8. The wingbeat frequency of these flies is 213 +/- 4 s-1.